Efficient system identification schemes for communication systems

ABSTRACT

Systems and methodologies are described that facilitate efficiently indicating parameter(s) associated with a base station utilizing synchronization signals in a wireless communication environment. For instance, relative locations of a PSC and a SSC in a radio frame can be a function of a parameter. Further, a PSC sequence utilized to generate PSCs can be selected based upon a parameter. Moreover, inclusion or exclusion of PSCs from a radio frame can be a function of a parameter. Additionally or alternatively, pseudo random sequence mappings (e.g., to cell IDs, tone locations) can be a function of a parameter. Example parameters can be whether the base station is part of a TDD or a FDD system, whether the radio frame employs FS 1  or FS 2,  whether the base station is associated with a macro or a femto cell, or whether the base station is associated with a unicast or a multicast system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication Ser. No. 60/979,056 entitled “EFFICIENT SYSTEMIDENTIFICATION SCHEMES FOR COMMUNICATION SYSTEMS” which was filed Oct.10, 2007, U.S. Provisional Patent Application Ser. No. 60/982,265entitled “EFFICIENT SYSTEM IDENTIFICATION SCHEMES FOR COMMUNICATIONSYSTEMS” which was filed Oct. 24, 2007, and U.S. Provisional PatentApplication Ser. No. 61/023,528 entitled “EFFICIENT SYSTEMIDENTIFICATION SCHEMES FOR COMMUNICATION SYSTEMS” which was filed Jan.25, 2008. The entireties of the aforementioned applications are hereinincorporated by reference.

BACKGROUND

I. Field

The following description relates generally to wireless communications,and more particularly to employing an efficient scheme for indicatingsystem parameter(s) in a wireless communication system.

II. Background

Wireless communication systems are widely deployed to provide varioustypes of communication; for instance, voice and/or data can be providedvia such wireless communication systems. A typical wirelesscommunication system, or network, can provide multiple users access toone or more shared resources (e.g., bandwidth, transmit power, . . . ).For instance, a system can use a variety of multiple access techniquessuch as Frequency Division Multiplexing (FDM), Time DivisionMultiplexing (TDM), Code Division Multiplexing (CDM), OrthogonalFrequency Division Multiplexing (OFDM), and others.

Generally, wireless multiple-access communication systems cansimultaneously support communication for multiple access terminals. Eachaccess terminal can communicate with one or more base stations viatransmissions on forward and reverse links. The forward link (ordownlink) refers to the communication link from base stations to accessterminals, and the reverse link (or uplink) refers to the communicationlink from access terminals to base stations. This communication link canbe established via a single-in-single-out, multiple-in-single-out or amultiple-in-multiple-out (MIMO) system.

MIMO systems commonly employ multiple (N_(T)) transmit antennas andmultiple (N_(R)) receive antennas for data transmission. A MIMO channelformed by the N_(T) transmit and N_(R) receive antennas can bedecomposed into N_(S) independent channels, which can be referred to asspatial channels, where N_(S)≦{N_(T), N_(R)}. Each of the N_(S)independent channels corresponds to a dimension. Moreover, MIMO systemscan provide improved performance (e.g., increased spectral efficiency,higher throughput and/or greater reliability) if the additionaldimensionalities created by the multiple transmit and receive antennasare utilized.

MIMO systems can support various duplexing techniques to divide forwardand reverse link communications over a common physical medium. Forinstance, frequency division duplex (FDD) systems can utilize disparatefrequency regions for forward and reverse link communications. Further,in time division duplex (TDD) systems, forward and reverse linkcommunications can employ a common frequency region so that thereciprocity principle allows estimation of the forward link channel fromreverse link channel.

Wireless communication systems oftentimes employ one or more basestations that provide a coverage area. A typical base station cantransmit multiple data streams for broadcast, multicast and/or unicastservices, wherein a data stream may be a stream of data that can be ofindependent reception interest to an access terminal. An access terminalwithin the coverage area of such base station can be employed to receiveone, more than one, or all the data streams carried by the compositestream. Likewise, an access terminal can transmit data to the basestation or another access terminal.

Various parameter(s) can be associated with each base station in awireless communication system. The parameter(s) can relate to radioframe structure type, duplexing technique, cell type, unicast versusmulticast operation, and so forth. For example, the base station canutilize one of two possible radio frame structures (e.g., framestructure type 1 or frame structure type 2 as set forth in the EvolvedUMTS Terrestrial Radio Access (E-UTRA) specification). Further, the basestation can be part of a TDD system or a FDD system. Moreover, the basestation can be associated with a macro cell or a femto cell.Additionally or alternatively, the base station can be part of a unicastsystem or a multicast system.

Conventionally, an access terminal lacks knowledge of parameter(s)associated with a base station with which it is interacting uponinitialization of a connection therebetween. For instance, uponpower-up, an access terminal can begin to transmit data to and/orreceive data from a particular base station. However, the accessterminal can be unaware of the radio frame structure type, duplexingtechnique, cell type, and/or unicast/multicast operation utilized by orassociated with the base station with which it is communicating.

Common techniques employed by access terminals to identify variousparameter(s) associated with corresponding base stations are oftentimesinefficient and time consuming. By way of illustration, an accessterminal typically effectuates acquisition by decoding information sentover a broadcast channel as well as subsequently transferredinformation. Thus, signals sent by the base station are commonly decodedto determine one or more of the aforementioned parameters. However,decoding of these signals can be difficult at best when suchparameter(s) are unknown. According to an example, an access terminalcan be unable to differentiate between use of frame structure type 1 andframe structure type 2 when employing blind cyclic prefix (CP)detection.

SUMMARY

The following presents a simplified summary of one or more embodimentsin order to provide a basic understanding of such embodiments. Thissummary is not an extensive overview of all contemplated embodiments,and is intended to neither identify key or critical elements of allembodiments nor delineate the scope of any or all embodiments. Its solepurpose is to present some concepts of one or more embodiments in asimplified form as a prelude to the more detailed description that ispresented later.

In accordance with one or more embodiments and corresponding disclosurethereof, various aspects are described in connection with facilitatingefficient indication of parameter(s) associated with a base stationutilizing synchronization signals in a wireless communicationenvironment. For instance, relative locations of a PSC and a SSC in aradio frame can be a function of a parameter. Further, a PSC sequenceutilized to generate PSCs can be selected based upon a parameter.Moreover, inclusion or exclusion of PSCs from a radio frame can be afunction of a parameter. Additionally or alternatively, pseudo randomsequence mappings (e.g., to cell IDs, tone locations) can be a functionof a parameter. Example parameters can be whether the base station ispart of a TDD or a FDD system, whether the radio frame employs FS1 orFS2, whether the base station is associated with a macro or a femtocell, or whether the base station is associated with a unicast or amulticast system.

According to related aspects, a method that facilitates identifying oneor more parameters related to a base station in a wireless communicationenvironment is described herein. The method can include generating aprimary synchronization code (PSC) and a secondary synchronization code(SSC). Further, the method can comprise scheduling the PSC and the SSCat relative locations in a radio frame as a function of a firstparameter corresponding to a base station. Moreover, the method caninclude transmitting the radio frame over a downlink to indicate thefirst parameter based upon the relative locations of the PSC and theSSC.

Another aspect relates to a wireless communications apparatus. Thewireless communications apparatus can include a memory that retainsinstructions related to selecting a primary synchronization code (PSC)sequence based upon a first parameter of a base station, generating aprimary synchronization code (PSC) based upon the selected PSC sequence,and transmitting a radio frame that includes the generate PSC over adownlink to indicate the first parameter based upon the selected PSCsequence. Further, the wireless communications apparatus can include aprocessor, coupled to the memory, configured to execute the instructionsretained in the memory.

Yet another aspect relates to a wireless communications apparatus thatenables efficiently indicating one or more parameters to at least oneaccess terminal in a wireless communication environment. The wirelesscommunications apparatus can include means for scheduling a primarysynchronization code (PSC) and a secondary synchronization code (SSC) atrelative locations in a radio frame as a function of a first parametercorresponding to a base station. Further, the wireless communicationsapparatus can include means for sending the radio frame over a downlinkto identify the first parameter based upon the relative locations of thePSC and the SSC.

Still another aspect relates to a computer program product that cancomprise a computer-readable medium. The computer-readable medium caninclude code for selecting a primary synchronization code (PSC) sequencebased upon a first parameter of a base station. Further, thecomputer-readable medium can include code for generating a primarysynchronization code (PSC) based upon the selected PSC sequence.Moreover, the computer-readable medium can include code for transmittinga radio frame that includes the generate PSC over a downlink to indicatethe first parameter based upon the selected PSC sequence.

In accordance with another aspect, an apparatus in a wirelesscommunication system can include a processor, wherein the processor canbe configured to schedule a primary synchronization code (PSC) and asecondary synchronization code (SSC) at relative locations in a radioframe as a function of a first parameter corresponding to a basestation. Moreover, the processor can be configured to send the radioframe over a downlink to identify the first parameter based upon therelative locations of the PSC and the SSC.

According to other aspects, a method that facilitates deciphering atleast one parameter corresponding to a base station in a wirelesscommunication environment is described herein. The method can includereceiving a radio frame from a base station. Moreover, the method caninclude analyzing the radio frame to determine at least one of relativelocations of disparate types of synchronization signals, a sequenceutilized to generate a particular type of synchronization signal, orwhether the radio frame includes two types of synchronization signals.Further, the method can comprise recognizing at least one parameterassociated with the base station based upon the relative locations, thesequence, or whether the radio frame includes two types ofsynchronization signals.

Yet another aspect relates to a wireless communications apparatus thatcan include a memory that retains instructions related to receiving aradio frame from a base station, analyzing the radio frame to determineat least one of relative locations of disparate types of synchronizationsignals, a sequence utilized to generate a particular type ofsynchronization signal, or whether the radio frame includes two types ofsynchronization signals, and recognizing at least one parameterassociated with the base station based upon the relative locations, thesequence, or whether the radio frame includes two types ofsynchronization signals. Further, the wireless communications apparatuscan comprise a processor, coupled to the memory, configured to executethe instructions retained in the memory.

Another aspect relates to a wireless communications apparatus thatenables identifying one or more parameters relative to a base station ina wireless communication environment. The wireless communicationsapparatus can include means for analyzing a radio frame received from abase station to decipher at least one of relative locations of disparatetypes of synchronization signals, a sequence utilized to generate aparticular type of synchronization signal, or whether the radio frameincludes two types of synchronization signals. Further, the wirelesscommunications apparatus can include means for recognizing at least oneparameter associated with the base station based upon the relativelocations, the sequence, or whether the radio frame includes two typesof synchronization signals.

Still another aspect relates to a computer program product that cancomprise a computer-readable medium. The computer-readable medium caninclude code for analyzing a radio frame received from a base station todecipher at least one of relative locations of disparate types ofsynchronization signals, a sequence utilized to generate a particulartype of synchronization signal, or whether the radio frame includes twotypes of synchronization signals. Moreover, the computer-readable mediumcan comprise code for recognizing at least one parameter associated withthe base station based upon the relative locations, the sequence, orwhether the radio frame includes two types of synchronization signals.

In accordance with another aspect, an apparatus in a wirelesscommunication system can include a processor, wherein the processor canbe configured to evaluate a radio frame received from a base station todecipher at least one of relative locations of disparate types ofsynchronization signals, a sequence utilized to generate a particulartype of synchronization signal, or whether the radio frame includes twotypes of synchronization signals. Further, the processor can beconfigured to determine at least one parameter associated with the basestation based upon the relative locations, the sequence, or whether theradio frame includes two types of synchronization signals.

To the accomplishment of the foregoing and related ends, the one or moreembodiments comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative aspects ofthe one or more embodiments. These aspects are indicative, however, ofbut a few of the various ways in which the principles of variousembodiments can be employed and the described embodiments are intendedto include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a wireless communication system inaccordance with various aspects set forth herein.

FIG. 2 is an illustration of an example frame structure type 1 (FS1)radio frame.

FIG. 3 is an illustration of an example frame structure type 2 (FS2)radio frame.

FIG. 4 is an illustration of an example system that utilizessynchronization signals to indicate base station related parameter(s) ina wireless communication environment.

FIGS. 5-6 are illustrations of example radio frame structures thatutilize relative positions of synchronization signals to disseminateinformation related to one or more parameters.

FIG. 7 is an illustration of an example methodology that facilitatesidentifying one or more parameters related to a base station in awireless communication environment.

FIG. 8 is an illustration of an example methodology that facilitatesindicating one or more parameters corresponding to a base station in awireless communication environment.

FIG. 9 is an illustration of an example methodology that facilitatesdeciphering at least one parameter corresponding to a base station in awireless communication environment.

FIG. 10 is an illustration of an example access terminal that recognizesparameter(s) associated with a base station utilizing an efficientidentification scheme in a wireless communication system.

FIG. 11 is an illustration of an example system that utilizessynchronization signals to indicate parameter(s) to access terminals ina wireless communication environment.

FIG. 12 is an illustration of an example wireless network environmentthat can be employed in conjunction with the various systems and methodsdescribed herein.

FIG. 13 is an illustration of an example system that enables efficientlyindicating one or more parameters to at least one access terminal in awireless communication environment.

FIG. 14 is an illustration of an example system that enables identifyingone or more parameters relative to a base station in a wirelesscommunication environment.

DETAILED DESCRIPTION

Various embodiments are now described with reference to the drawings,wherein like reference numerals are used to refer to like elementsthroughout. In the following description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of one or more embodiments. It may be evident, however,that such embodiment(s) may be practiced without these specific details.In other instances, well-known structures and devices are shown in blockdiagram form in order to facilitate describing one or more embodiments.

As used in this application, the terms “component,” “module,” “system,”and the like are intended to refer to a computer-related entity, eitherhardware, firmware, a combination of hardware and software, software, orsoftware in execution. For example, a component can be, but is notlimited to being, a process running on a processor, a processor, anobject, an executable, a thread of execution, a program, and/or acomputer. By way of illustration, both an application running on acomputing device and the computing device can be a component. One ormore components can reside within a process and/or thread of executionand a component can be localized on one computer and/or distributedbetween two or more computers. In addition, these components can executefrom various computer readable media having various data structuresstored thereon. The components can communicate by way of local and/orremote processes such as in accordance with a signal having one or moredata packets (e.g., data from one component interacting with anothercomponent in a local system, distributed system, and/or across a networksuch as the Internet with other systems by way of the signal).

The techniques described herein can be used for various wirelesscommunication systems such as code division multiple access (CDMA), timedivision multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier-frequency division multiple access (SC-FDMA) and other systems.The terms “system” and “network” are often used interchangeably. A CDMAsystem can implement a radio technology such as Universal TerrestrialRadio Access (UTRA), CDMA2000, etc. UTRA includes Wideband-CDMA (W-CDMA)and other variants of CDMA. CDMA2000 covers IS-2000, IS-95 and IS-856standards. A TDMA system can implement a radio technology such as GlobalSystem for Mobile Communications (GSM). An OFDMA system can implement aradio technology such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband(UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20,Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunication System (UMTS). 3GPP Long Term Evolution (LTE) is anupcoming release of UMTS that uses E-UTRA, which employs OFDMA on thedownlink and SC-FDMA on the uplink.

Single carrier frequency division multiple access (SC-FDMA) utilizessingle carrier modulation and frequency domain equalization. SC-FDMA hassimilar performance and essentially the same overall complexity as thoseof an OFDMA system. A SC-FDMA signal has lower peak-to-average powerratio (PAPR) because of its inherent single carrier structure. SC-FDMAcan be used, for instance, in uplink communications where lower PAPRgreatly benefits access terminals in terms of transmit power efficiency.Accordingly, SC-FDMA can be implemented as an uplink multiple accessscheme in 3GPP Long Term Evolution (LTE) or Evolved UTRA.

Furthermore, various embodiments are described herein in connection withan access terminal. An access terminal can also be called a system,subscriber unit, subscriber station, mobile station, mobile, remotestation, remote terminal, mobile device, user terminal, terminal,wireless communication device, user agent, user device, or userequipment (UE). An access terminal can be a cellular telephone, acordless telephone, a Session Initiation Protocol (SIP) phone, awireless local loop (WLL) station, a personal digital assistant (PDA), ahandheld device having wireless connection capability, computing device,or other processing device connected to a wireless modem. Moreover,various embodiments are described herein in connection with a basestation. A base station can be utilized for communicating with accessterminal(s) and can also be referred to as an access point, Node B,Evolved Node B (eNodeB) or some other terminology.

Moreover, various aspects or features described herein can beimplemented as a method, apparatus, or article of manufacture usingstandard programming and/or engineering techniques. The term “article ofmanufacture” as used herein is intended to encompass a computer programaccessible from any computer-readable device, carrier, or media. Forexample, computer-readable media can include but are not limited tomagnetic storage devices (e.g., hard disk, floppy disk, magnetic strips,etc.), optical disks (e.g., compact disk (CD), digital versatile disk(DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card,stick, key drive, etc.). Additionally, various storage media describedherein can represent one or more devices and/or other machine-readablemedia for storing information. The term “machine-readable medium” caninclude, without being limited to, wireless channels and various othermedia capable of storing, containing, and/or carrying instruction(s)and/or data.

Referring now to FIG. 1, a wireless communication system 100 isillustrated in accordance with various embodiments presented herein.System 100 comprises a base station 102 that can include multipleantenna groups. For example, one antenna group can include antennas 104and 106, another group can comprise antennas 108 and 110, and anadditional group can include antennas 112 and 114. Two antennas areillustrated for each antenna group; however, more or fewer antennas canbe utilized for each group. Base station 102 can additionally include atransmitter chain and a receiver chain, each of which can in turncomprise a plurality of components associated with signal transmissionand reception (e.g., processors, modulators, multiplexers, demodulators,demultiplexers, antennas, etc.), as will be appreciated by one skilledin the art.

Base station 102 can communicate with one or more access terminals suchas access terminal 116 and access terminal 122; however, it is to beappreciated that base station 102 can communicate with substantially anynumber of access terminals similar to access terminals 116 and 122.Access terminals 116 and 122 can be, for example, cellular phones, smartphones, laptops, handheld communication devices, handheld computingdevices, satellite radios, global positioning systems, PDAs, and/or anyother suitable device for communicating over wireless communicationsystem 100. As depicted, access terminal 116 is in communication withantennas 112 and 114, where antennas 112 and 114 transmit information toaccess terminal 116 over a forward link 118 and receive information fromaccess terminal 116 over a reverse link 120. Moreover, access terminal122 is in communication with antennas 104 and 106, where antennas 104and 106 transmit information to access terminal 122 over a forward link124 and receive information from access terminal 122 over a reverse link126. In a frequency division duplex (FDD) system, forward link 118 canutilize a different frequency band than that used by reverse link 120,and forward link 124 can employ a different frequency band than thatemployed by reverse link 126, for example. Further, in a time divisionduplex (TDD) system, forward link 118 and reverse link 120 can utilize acommon frequency band and forward link 124 and reverse link 126 canutilize a common frequency band.

Each group of antennas and/or the area in which they are designated tocommunicate can be referred to as a sector of base station 102. Forexample, antenna groups can be designed to communicate to accessterminals in a sector of the areas covered by base station 102. Incommunication over forward links 118 and 124, the transmitting antennasof base station 102 can utilize beamforming to improve signal-to-noiseratio of forward links 118 and 124 for access terminals 116 and 122.Also, while base station 102 utilizes beamforming to transmit to accessterminals 116 and 122 scattered randomly through an associated coverage,access terminals in neighboring cells can be subject to lessinterference as compared to a base station transmitting through a singleantenna to all its access terminals.

System 100 employs an efficient scheme for identifying systemparameter(s). Base station 102 can utilize synchronization signals toindicate one or more parameters associated with base station 102 toaccess terminals 116 and 122. By employing synchronization signals toprovide notification as to various parameter(s) associated with basestation 102, blind decoding of downlink information by access terminals116 and 122 without knowledge of such parameter(s) can be mitigated.Thus, access terminals 116 and 122 can use the synchronization signalsto identify parameter(s) without effectuating blind decoding ofinformation sent over the downlink, which leads to more efficientnotification of such parameter(s) to access terminals 116 and 122.

One or more parameters can be indicated to access terminals 116 and 122via the synchronization signals. For instance, the synchronizationsignals can inform access terminals 116 and 122 whether base station 102employs frame structure type 1 (FS1) or frame structure type 2 (FS2).According to another illustration, the synchronization signals canindicate to access terminals 116 and 122 whether base station 102 ispart of a time division duplex (TDD) system or a frequency divisionduplex (FDD) system. Pursuant to another example, the synchronizationsignals can specify to access terminals 116 and 122 whether base station102 is associated with a macro cell or a femto cell. Additionally oralternatively, the synchronization signals can notify access terminals116 whether base station 102 is associated with a unicast system or amulticast system. It is to be appreciated, however, that the claimedsubject matter is not limited to the aforementioned example parameters;rather, any other parameters related to base station 102 are intended tofall within the scope of the hereto appended claims.

One or more types of synchronization signals can be transmitted by basestation 102. For instance, a primary synchronization code (PSC) signaland/or a secondary synchronization code (SSC) signal can be transferredby base station 102. A primary synchronization code signal can be asynchronization signal used for cell detection during initial cellsearch and a secondary synchronization code signal can be asynchronization signal used for cell identification during initial cellsearch.

A primary synchronization signal can be generated based on a PSCsequence and referred to as a PSC signal. The PSC sequence can be aconstant amplitude zero auto correlation (CAZAC) sequence, apseudo-random number (PN) sequence, etc. Some example CAZAC sequencesinclude a Chu sequence, a Zadoff-Chu sequence, a Frank sequence, ageneralized chirp-like (GCL) sequence, and the like. A secondarysynchronization signal can be generated based on a SSC sequence andreferred to as a SSC signal. The SSC sequence can be a maximum-lengthsequence (M-sequence), a PN sequence, a binary sequence, etc. Further,the PSC signal can be referred to as the primary synchronization signal,PSC, etc. and the SSC signal can be referred to as the secondarysynchronization signal, SSC, etc.

In system 100, parameters corresponding to base station 102 can beindicated based upon one or more factors corresponding to thesynchronization signals such as relative location of different types ofsynchronization signals within a radio frame, selected sequence utilizedto generate the synchronization signals of a given type, inclusion orexclusion of a particular type of synchronization signal, and so forth.In contrast, conventional techniques oftentimes leverage blind detectionof cyclic prefixes (CPs) by access terminals for attempting to identifyparameters, which can be ineffective and/or inefficient. For instance,CP lengths can be different between FS2 and FS1 in PSC and SSC (e.g.,8.33 microseconds (us) and 17.71 us for PSC and SSC, respectively, forFS2 versus 5.21 us and 16.67 us for PSC and SSC, respectively, for FS1).CP can be blindly detected between normal CP (e.g., 5.21 us) andextended CP (e.g., 16.67 us) for FS1 by an access terminal. Further, anaccess terminal can utilize blind CP detection for FS2 to differentiatenormal CP (e.g., 8.33 us) and extended CP (e.g., 17.71 us). As a result,such conventional techniques using CP blind detection can be unable todifferentiate FS1 from FS2.

Further, primary broadcast channel (PBCH) locations can be differentbetween FS1 and FS2. Blind PBCH decoding, oftentimes effectuated bycommon approaches, can be carried out by doubling access terminal PBCHdecoding complexity (e.g., 24 blind decoding including blind antennadetection and 40 ms frame boundary detection during initial acquisitionper 10 ms) to differentiate FS1 from FS2. In addition, SSC detection canbe doubled due to four different CP lengths being utilized unlessunification is leveraged; however, unification can be cost-prohibitivegiven that FS2 can assume that guard gap (GP) is absorbed in CP unlessFS1 pays higher overheads for FDD normal CP). Thus, common techniquescan inefficiently differentiate FS1 from FS2.

Moreover, conventional techniques can fail to provide sufficient guardtime between downlink pilot time slot (DwPTS) and uplink pilot time slot(UpPTS) for FS2. In contrast, system 100 can provide a larger guard timefor uplink and downlink switching.

Now referring to FIGS. 2-3, illustrated are example radio framestructures. Two radio frame structures are set forth in the E-UTRAspecification: namely, frame structure type 1 (FS1) and frame structuretype 2 (FS2). FS1 can be applicable to both FDD and TDD systems, whileFS2 can be applicable to TDD systems. It is to be appreciated that FIGS.2-3 are provided for illustrative purposes and the disclosed subjectmatter is not limited to the scope of these examples (e.g., radio frameswith any duration, number of subframes, number of slots, and the likecan be employed, . . . ).

Turning to FIG. 2, illustrated is an example frame structure type 1(FS1) radio frame 200. FS1 radio frame 200 can be utilized in connectionwith FDD or TDD. Further, FS1 radio frame 200 can be a 10 ms radio framethat includes 20 slots (e.g., slot 0, . . . , slot 19), where each ofthe slots has a duration of 0.5 ms. Moreover, two adjacent slots (e.g.,slots 0 and 1, slots 2 and 3, . . . ) from FS1 radio frame 200 can makeup one subframe with a duration of 1 ms; accordingly, FS1 radio frame200 can include 10 subframes.

With reference to FIG. 3, illustrated is an example frame structure type2 (FS2) radio frame 300. FS2 radio frame 300 can be employed inconnection with TDD. FS2 radio frame 300 can be a 10 ms radio frame thatincludes 10 subframes. Further, FS2 radio frame 300 can include twosubstantially similar half-frames (e.g., half-frame 302 and half-frame304), each of which can have a duration of 5 ms. Each of the half-frames302-304 can include eight slots, each with a duration of 0.5 ms, andthree fields (e.g., DwPTS, GP, and UpPTS) that each have configurableindividual lengths and a total length of 1 ms. A subframe includes twoadjacent slots, except for subframes 1 and 6, which include DwPTS, GP,and UpPTS.

Referring to FIG. 4, illustrated is a system 400 that utilizessynchronization signals to indicate base station related parameter(s) ina wireless communication environment. System 400 includes a base station402 that can transmit and/or receive information, signals, data,instructions, commands, bits, symbols, and the like. Base station 402can communicate with an access terminal 404 via the forward link and/orreverse link. Access terminal 404 can transmit and/or receiveinformation, signals, data, instructions, commands, bits, symbols, andthe like. Moreover, although not shown, it is contemplated that anynumber of base stations similar to base station 402 can be included insystem 400 and/or any number of access terminals similar to accessterminal 404 can be included in system 400.

Base station 402 can be associated with one or more parameter(s) 406that are to be disseminated to access terminal 404 via synchronizationsignals. Further, base station 402 can include a synchronization signalgenerator 408 that yields synchronization signals for downlinktransmission as a function of the one or more parameter(s) 406corresponding to base station 402. For example, synchronization signalgenerator 408 can yield synchronization signal(s) for transmission basedupon a chosen sequence, schedule types of synchronization signal(s)within a radio frame, enable or inhibit inclusion of a given type ofsynchronization signal, choose a pseudo-random sequence to be employed,a combination thereof, and so forth based upon the parameter(s) 406 ofbase station 402 being indicated to access terminal 404. Moreover, thesynchronization signals provided by synchronization signal generator 408can be transmitted to access terminal 404.

Access terminal 404 can receive the synchronization signals from basestation 402 and determine parameter(s) associated with base station 402based upon the received synchronization signals. Access terminal 404 canfurther include a synchronization signal evaluator 410 and a parameteridentifier 412. Synchronization signal evaluator 410 can analyze thereceived synchronization signals. By way of illustration,synchronization signal evaluator 410 can determine an identity of asequence pertaining to a given type of received synchronization signals,relative locations of different types of synchronization signals withina radio frame, inclusion or exclusion of a given type of synchronizationsignal, pseudo-random sequence utilized, a combination thereof, etc.Further, based upon the analysis, parameter identifier 412 can recognizeparameter(s) associated with base station 402. Parameter identifier 412can leverage the analysis of the received synchronization signalseffectuated by synchronization signal evaluator 410 to decipher theparameter(s) corresponding to base station 402 based upon a prioriknowledge of how synchronization signal generator 408 selects,schedules, etc. synchronization signals. For example, the relativelocation of different types of synchronization signals in a radio frameas recognized by synchronization signal evaluator 410 can be utilized byparameter identifier 412 to determine whether frame structure type 1 orframe structure type 2 is employed by base station 402; however, it isto be appreciated that the claimed subject matter is not limited to suchexample.

Synchronization signal generator 408 of base station 402 can include aselector 414 that can determine a synchronization code sequence toemploy for generating synchronization signals. Different PSC sequencescan be elected by selector 414 as a function of a parameter 406, andPSCs can be yielded based upon the selected PSC sequences bysynchronization signal generator 408 for transmission over the downlink.Thus, synchronization signal evaluator 410 can detect which PSC sequenceis chosen by selector 414 and used by synchronization signal generator408 for received synchronization signals (e.g., PSCs, . . . ), andparameter identifier 412 can recognize the parameter corresponding tothe detected PSC sequence.

For example, different PSC sequences can be chosen by selector 414 foruse by synchronization signal generator 408 to differentiate between FS1and FS2. Conventional systems oftentimes employ three PSC sequences(e.g., two of these three PSC sequences can be complex conjugates ofeach other, . . . ). In contrast, system 400 can add one additional PSCsequence (e.g., a fourth PSC sequence, . . . ). The fourth PSC sequencecan be defined in the frequency domain as a complex conjugate of the PSCsequence out of the three commonly employed PSC sequences fromconventional systems that is not a complex conjugate of the other twoPSC sequences. Further, selector 414 can choose to utilize the threecommonly employed PSC sequences if base station 402 utilizes FS1 and theadditional, fourth PSC sequence if base station 402 employs FS2. Thus,one PSC sequence can be used to indicate FS2, while three PSC sequencescan be utilized to signify FS1. Accordingly, synchronization signalevaluator 410 can attempt to detect these four PSC sequences. If one ofthe three commonly employed PSC sequences is detected by synchronizationsignal evaluator 410, then parameter identifier 412 can recognize thatbase station 402 utilizes FS1. Alternatively, if the fourth PSC sequenceis detected by synchronization signal evaluator 410, then parameteridentifier 412 can determine that base station 402 employs FS2.According to another illustration, it is contemplated that the fourthPSC sequence can be leveraged to identify use of FS1 by base station402, while the other three commonly employed PSC sequences can beemployed to identify use of FS2 by base station 402.

Pursuant to a further example, different PSC sequences can be utilizedby selector 414 to indicate that base station 402 is associated with aunicast system or a multicast system. Following this example, selector414 can choose a particular PSC sequence to be utilized bysynchronization signal generator 408 for yielding PSCs to differentiatea Multimedia Broadcast over a Single Frequency Network (MBSFN) carrierfrom other FDD/TDD systems (e.g., unicast carrier, . . . ). MBSFN canuse a time-synchronized common waveform that is transmitted frommultiple cells for a given duration; accordingly, multiple base stations(e.g., base station 402 and any number of disparate base station(s) (notshown), . . . ) can send the same information to access terminal 404.Further, the multicast system can use a MBSFN carrier, which can be adedicated carrier. Thus, selector 414 can allow for identifying toaccess terminal 404 whether base station 402 uses a MBSFN carrier.Similar to the above example, four PSC sequences can be leveraged bysystem 400 (e.g., the three commonly employed PSC sequences and theadditional, fourth sequence, . . . ). Again, the fourth PSC sequence canbe defined in the frequency domain as a complex conjugate of the PSCsequence out of the three commonly employed PSC sequences fromconventional systems that is not a complex conjugate of the other twoPSC sequences. Further, selector 414 can choose to utilize the threecommonly employed PSC sequences if base station 402 utilizes a non-MBSFNcarrier (e.g., unicast carrier, . . . ) and the additional, fourth PSCsequence if base station 402 employs the MBSFN carrier. Thus, one PSCsequence can be used to indicate use of the MBSFN carrier, while threePSC sequences can be utilized to signify use of the non-MBSFN carrier.Accordingly, synchronization signal evaluator 410 can attempt to detectthese four PSC sequences. If one of the three commonly employed PSCsequences is detected by synchronization signal evaluator 410, thenparameter identifier 412 can recognize that base station 402 utilizes anon-MBSFN carrier. Alternatively, if the fourth PSC sequence is detectedby synchronization signal evaluator 410, then parameter identifier 412can determine that base station 402 employs a MBSFN carrier. Accordingto another illustration, it is contemplated that the fourth PSC sequencecan be leveraged to identify use of a non-MBSFN carrier by base station402, while the other three commonly employed PSC sequences can beemployed to identify use of the MBSFN carrier by base station 402.Similarly, it is also contemplated that different PSC sequences can beutilized to distinguish between base station 402 being associated with afemto cell versus a nominal cell (e.g., macro cell, . . . ) and/or a TDDsystem versus a FDD system.

Synchronization signal generator 408 can additionally or alternativelyinclude a scheduler 416 that schedules disparate types ofsynchronization signals within each radio frame as a function ofparameter(s) 406 corresponding to base station 402. Thus, scheduler 416can determine and assign relative locations for PSC and SSC within theradio frame. Moreover, synchronization signal evaluator 410 can detectrelative positions of PSC and SSC, and based thereupon, parameteridentifier 412 can recognize one or more parameters associated with basestation 402. For instance, relative locations of PSC and SSC can be usedto differentiate between base station 402 being associated with FS1versus FS2, TDD versus FDD, unicast versus multicast operation, and/ormacro cell versus femto cell. Further, scheduler 416 can controllocations of PSC and SSC within a radio frame. Locations of PSC and SSCcan be used to represent different types/parts of the systeminformation, which can be associated with TDD or FDD types systems,cells with different sizes or purposes, and so forth.

With reference to FIGS. 5-6, illustrated are example radio framestructures 500 and 600 that utilize relative positions ofsynchronization signals to disseminate information related to one ormore parameters. Each radio frame (e.g., radio frame t 502, radio framet 602, . . . ) can be partitioned into multiple (e.g., S, where S can besubstantially any integer, . . . ) slots (e.g., or a subset of the Sslots can be replaced by fields as described herein for frame structuretype 2, . . . ), and each slot can include multiple (e.g., T, where Tcan be substantially any integer, . . . ) symbol periods. For example,each radio frame (e.g., radio frame 502, radio frame 602, . . . ) canhave a duration of 10 ms, and each slot can have a duration of 0.5 ms.Further, a subframe can include two adjacent slots (e.g., slot 0 andslot 1, . . . ). Moreover, each slot can cover 6 or 7 symbol periodsdepending on a cyclic prefix length. Although not shown, it is to beappreciated that a frame structure type 1 radio frame can include asubframe comprising slot 2 and slot 3 adjacent to the subframecomprising slot 0 and slot 1 (as well as a subframe comprising slotS/2+2 and slot S/2+3 adjacent to the subframe comprising slot S/2 andslot S/2+1), while a frame structure type 2 radio frame can include asubframe comprising fields (e.g., DwPTS, GP, and UpPTS) adjacent to thesubframe comprising slot 0 and slot 1 (as well as another subframecomprising such fields adjacent to the subframe comprising slot S/2 andslot S/2+1). Also, it is contemplated that the radio frames can bepartitioned in any disparate manner.

As illustrated, synchronization signals can be mapped to OFDM symbolsincluded in slot 0 504, 604 and slot S/2 506, 606 (e.g., slot 10, . . .). However, relative placement of PSC and SSC can differ (e.g., ascontrolled by scheduler 416 of FIG. 4, . . . ) between radio framestructures 500 and 600. As shown in FIG. 5, PSC is mapped to a last OFDMsymbol (e.g., symbol 508, symbol 510, . . . ) in slot 0 504 and slot S/2506 (e.g., the first and eleventh slots, . . . ), while SSC is mapped toan adjacent OFDM symbol (e.g., symbol 512, symbol 514, . . . ) prior tothe last OFDM symbol. Moreover, as shown in FIG. 6, SSC is mapped to alast OFDM symbol (e.g., symbol 608, symbol 610, . . . ) in slot 0 604and slot S/2 606 (e.g., the first and eleventh slots, . . . ), while PSCis mapped to an adjacent OFDM symbol (e.g., symbol 612, symbol 614, . .. ) prior to the last OFDM symbol.

Differences in relative positions of PSC and SSC can be a function ofone or more parameters. For example, the relative positions of PSC andSSC in a preamble and a middle amble can depend on whether a basestation transmits radio frames with FS1 or FS2. Following this example,in FS1, PSC can be mapped to the last OFDM symbol in the first andeleventh slots and SSC can be next to PSC as shown in FIG. 5. Moreover,in FS2, SSC can be mapped to the last OFDM symbol and PSC can be next toSSC as shown in FIG. 6. Further, a receiving access terminal can detectthe PSC and/or SSC to differentiate between such parameter(s). Thus,pursuant to the above example, the receiving access terminal candetermine relative positions of PSC and SSC, which can thereafter beleveraged to distinguish whether the transmitting base station utilizesFS1 or FS2. It is to be appreciated, however, that the claimed subjectmatter is not limited to the aforementioned example; rather, anydisparate parameter(s) in addition to or instead of frame structure typecan be indicated via the relative positions of PSC and SSC. Examples ofthese base station specific parameters can be, but are not limited to,whether the base station is associated with multicast versus unicastoperation, employs TDD versus FDD, and/or is associated with a femtocell or a macro cell. For instance, PSC and SSC can be placed atdifferent locations (e.g., in a preamble, middle amble, Nth subframe, .. . ) so that an access terminal can differentiate different cell types(e.g., nominal/macro cell versus femto cell, where a femto cell cantransmit at a lower power than other macro cells, . . . ) based on suchplacements.

Although FIGS. 5-6 depict PSC and SSC being mapped to the last twoadjacent OFDM symbols in slot 0 504, 604 and slot S/2 506, 606, it is tobe appreciated that the claimed subject matter is not so limited. Forinstance, PSC and/or SSC can be transmitted in any slots in addition toor instead of slot 0 504, 604 and slot S/2 506, 606. Further, PSC andSSC can be mapped to any OFDM symbols within a slot. By way of anotherexample, symbol separation between PSC and SSC (e.g., PSC and SSC beingadjacent, separated by one, two, etc. symbols, . . . ) can be a functionof one or more parameters. According to a further illustration, PSC neednot be transmitted; inclusion or exclusion of PSC can be a function ofone or more parameters.

Referring again to FIG. 4, scheduler 416 can also include or exclude PSCfrom a radio frame yielded for transmission as a function of one or moreparameters, for example. Following this example, PSC can be eliminatedin FS2 operation mode (e.g., in TDD type systems, . . . ). Further, thelocation for PSC in FS2 can be used for additional guard time for uplinkand downlink switching. Thus, one sequence can be defined forsynchronization (e.g., SSC can be reserved but with a different sequencedesign from FS1, . . . ).

By way of further illustration, synchronization signal generator 408 canemploy differing pseudo-random sequences (PRSs) as a function of one ormore parameters. For instance, depending on whether FS1 or FS2 isemployed by base station 402, different PRSs can be mapped to the samecell identifier (ID). The same PRSs can be reused between FS1 and FS2,but with different mappings to cell IDs. Additionally or alternatively,PRSs can be mapped to different tone locations depending on whether FS1or FS2 is employed.

In accordance with an example, PRS location in the frequency domain canbe linked to cell ID. Different cells can have different locations forthe PRS. Thus, to distinguish between different parameters, the samesequence can be used, but with different locations in the frequencydomain. An access terminal can detect the PRS to be able to determinethe associated parameters. According to an illustration, the PRSlocation can be used for validation purposes. Following thisillustration, a parameter can be indicated based upon relative locationsof PSC and SSC, PSC sequence selected to be utilized to generate PSCs,or inclusion/exclusion of PSC, and such parameter can also be notifiedto an access terminal via the PRS location for validation; however, theclaimed subject matter is not so limited.

According to another example, different systems can use differentscrambling codes on top of the SSC sequences so that access terminal 404can use this information to differentiate such systems. For instance,this information can be used to differentiate a TDD system versus a FDDsystem, a nominal (e.g., macro, . . . ) cell versus a femto cell, aunicast system versus a multicast system (e.g., MBSFN, . . . ), FS1versus FS2, and so forth. Hence, a particular scrambling code can beselected as a function of a parameter.

Pursuant to another illustration, in E-UTRAN, three PSC based scramblingsequences (SC) can be defined to scramble SSC sequences, where eachscrambling sequence can be determined by an index of a corresponding PSCsequence. N additional different scrambling sequences can be used toscramble SSC sequences. As a result, (SC1, SC2, SC3) can be used for aFDD system, while (SC4, SC5, SC6) can be used for a TDD system.Similarly, (SC7, SC8, . . . SCN) can be used for femto cells, and soforth. Thus, a set of scrambling codes out of a plurality of possiblesets can be selected as a function of a parameter.

Referring to FIGS. 7-9, methodologies relating to efficiently indicatingparameter(s) in a wireless communication environment are illustrated.While, for purposes of simplicity of explanation, the methodologies areshown and described as a series of acts, it is to be understood andappreciated that the methodologies are not limited by the order of acts,as some acts can, in accordance with one or more embodiments, occur indifferent orders and/or concurrently with other acts from that shown anddescribed herein. For example, those skilled in the art will understandand appreciate that a methodology could alternatively be represented asa series of interrelated states or events, such as in a state diagram.Moreover, not all illustrated acts can be required to implement amethodology in accordance with one or more embodiments.

With reference to FIG. 7, illustrated is a methodology 700 thatfacilitates identifying one or more parameters related to a base stationin a wireless communication environment. At 702, a primarysynchronization code (PSC) and a secondary synchronization code (SSC)can be generated. For instance, the PSC can be generated based upon aPSC sequence and the SSC can be generated based upon a SSC sequence. At704, the PSC and the SSC can be scheduled at relative locations in aradio frame as a function of a parameter corresponding to a basestation. According to an illustration, the parameter can be whether thebase station is part of a TDD system or a FDD system. By way of anotherexample, the parameter can be whether the radio frame employs framestructure type 1 (FS1) or frame structure type 2 (FS2). Moreover, theparameter can be whether the base station is associated with a macrocell or a femto cell. Pursuant to a further example, the parameter canbe whether the base station is associated with a unicast system or amulticast system. Any relative locations for the PSC and the SSC can beutilized to differentiate between parameters. For instance, whether thePSC or the SSC is mapped to an earlier OFDM symbol in one or more slotsof the radio frame can be a function of the parameter. According toanother example, symbol separation between the PSC and the SSC can be afunction of the parameter. At 706, the radio frame can be transmittedover a downlink to indicate the parameter based upon the relativelocations of the PSC and the SSC.

By way of example, the PSC can be mapped to a last OFDM symbol in one ormore slots of the radio frame, while the SSC can be mapped to anadjacent OFDM symbol immediately prior to the last OFDM symbol when FS1is employed. Following this example, the SSC can be mapped to the lastOFDM symbol in one or more slots of the radio frame, while the PSC canbe mapped to the adjacent OFDM symbol immediately prior to the last OFDMsymbol when FS2 is utilized. Based upon the transmitted radio frame, anaccess terminal can detect the relative locations of the PSC and the SSCto determine whether FS1 or FS2 is employed. It is to be appreciated,however, that the claimed subject matter is not limited to theaforementioned example.

According to another illustration (as described below), the PSC sequenceutilized to generate the PSC for inclusion in the radio frame can beselected as a function of a parameter, which can be the same or differfrom the parameter indicated via the relative locations. By way offurther example, different pseudo random sequences (PRSs) can be mappedto a common cell ID as a function of a parameter (e.g., same ordifferent parameter as indicated via the relative locations, . . . ).Additionally or alternatively, PRSs can be mapped to different tonelocations based upon a parameter (e.g., same or different parameter asindicated via the relative locations, . . . ). For instance, PRSmappings can be leveraged as a validation mechanism for the parameterindicated by way of the relative locations of the PSC and the SSC;however, the claimed subject matter is not so limited. According toanother illustration, the PSC can be eliminated from the radio framewhen utilizing FS2; however, the claimed subject matter is not solimited. By way of further example, a particular scrambling code from aset of possible scrambling codes can be selected to be employed on topof a SSC sequence to yield the SSC as a function of a parameter.Additionally or alternatively, a set of possible scrambling codes, fromwhich a particular scrambling code can be chosen to be utilized on topof a SSC sequence to generate the SSC, can be selected as a function ofa parameter.

Now turning to FIG. 8, illustrated is a methodology 800 that facilitatesindicating one or more parameters corresponding to a base station in awireless communication environment. At 802, a primary synchronizationcode (PSC) sequence can be selected based upon a parameter of a basestation. For instance, four possible PSC sequences can be employed,which can include three commonly utilized PSC sequences and oneadditional PSC sequence. Two of the commonly utilized PSC sequences canbe complex conjugates of each other, while the third of the commonlyutilized PSC sequences and the fourth, additional PSC sequence can becomplex conjugates of each other. Further, either one of the threecommonly utilized PSC sequences or the fourth, additional PSC sequencecan be selected for use based upon the parameter. At 804, a primarysynchronization code (PSC) can be generated based upon the selected PSCsequence. At 806, a radio frame that includes the generated PSC can betransmitted over a downlink to indicate the parameter based upon theselected PSC sequence. For instance, an access terminal that receivesthe radio frame can detect the selected PSC sequence and determine theparameter based thereupon.

In accordance with an example, selection of the PSC sequence can beutilized to differentiate between FS1 and FS2. Following this example,one of the three commonly utilized PSC sequences can be chosen when FS1is employed, while the fourth, additional PSC sequence can be selectedwhen FS2 is utilized (or vice versa). By way of another illustration,selection of the PSC sequence can be used to differentiate between thebase station being associated with a unicast system and a multicastsystem. Thus, one of the three commonly utilized PSC sequences can beselected when a unicast carrier is used, while the fourth, additionalPSC sequence can be chosen when a MBSFN carrier is utilized (or viceversa). Moreover, relative locations of the PSC and the SSC, PRSmappings, choice of scrambling code, election of scrambling code set,etc. can be leveraged in conjunction with selection of the PSC sequenceto provide notification related to the same parameter (e.g., indicatedvia PSC sequence selection, . . . ) or different parameter(s).

Referring to FIG. 9, illustrated is a methodology 900 that facilitatesdeciphering at least one parameter corresponding to a base station in awireless communication environment. At 902, a radio frame can bereceived from a base station. At 904, the radio frame can be analyzed todetermine at least one of relative locations of disparate types ofsynchronization signals, a sequence utilized to generate a particulartype of synchronization signal, or whether the radio frame includes twotypes of synchronization signals. For instance, relative locations of aPSC with respect to a SSC can be identified. According to anotherexample, a PSC sequence utilized to generate PSCs can be determined.Additionally or alternatively, a PSC can be identified as being includedor excluded from the received radio frame. By way of furtherillustration, a scrambling code utilized by the base station to scramblethe SSC can be identified. At 906, at least one parameter associatedwith the base station can be recognized based upon the relativelocations, the sequence, or whether the radio frame includes two typesof synchronization signals. Further, the at least one parameter can bevalidated based upon an evaluation of a utilized PRS sequence.

It will be appreciated that, in accordance with one or more aspectsdescribed herein, inferences can be made regarding efficiently notifyingand/or identifying parameter(s) associated with a base station in awireless communication environment. As used herein, the term to “infer”or “inference” refers generally to the process of reasoning about orinferring states of the system, environment, and/or user from a set ofobservations as captured via events and/or data. Inference can beemployed to identify a specific context or action, or can generate aprobability distribution over states, for example. The inference can beprobabilistic—that is, the computation of a probability distributionover states of interest based on a consideration of data and events.Inference can also refer to techniques employed for composinghigher-level events from a set of events and/or data. Such inferenceresults in the construction of new events or actions from a set ofobserved events and/or stored event data, whether or not the events arecorrelated in close temporal proximity, and whether the events and datacome from one or several event and data sources.

According to an example, one or more methods presented above can includemaking inferences pertaining to determining an identity of one or moreparameters associated with a base station based upon an evaluation ofreceived synchronization signal(s). By way of further illustration, aninference can be made related to determining a notification schemeemployed by a base station for communicating one or more parameter(s)associated therewith via the downlink. It will be appreciated that theforegoing examples are illustrative in nature and are not intended tolimit the number of inferences that can be made or the manner in whichsuch inferences are made in conjunction with the various embodimentsand/or methods described herein.

FIG. 10 is an illustration of an access terminal 1000 that recognizesparameter(s) associated with a base station utilizing an efficientidentification scheme in a wireless communication system. Accessterminal 1000 comprises a receiver 1002 that receives a signal from, forinstance, a receive antenna (not shown), and performs typical actionsthereon (e.g., filters, amplifies, downconverts, etc.) the receivedsignal and digitizes the conditioned signal to obtain samples. Receiver1002 can be, for example, an MMSE receiver, and can comprise ademodulator 1004 that can demodulate received symbols and provide themto a processor 1006 for channel estimation. Processor 1006 can be aprocessor dedicated to analyzing information received by receiver 1002and/or generating information for transmission by a transmitter 1016, aprocessor that controls one or more components of access terminal 1000,and/or a processor that both analyzes information received by receiver1002, generates information for transmission by transmitter 1016, andcontrols one or more components of access terminal 1000.

Access terminal 1000 can additionally comprise memory 1008 that isoperatively coupled to processor 1006 and that can store data to betransmitted, received data, and any other suitable information relatedto performing the various actions and functions set forth herein. Memory1008, for instance, can store protocols and/or algorithms associatedwith analyzing synchronization signal(s) included in received radioframes and/or determining parameter(s) based upon such analysis.

It will be appreciated that the data store (e.g., memory 1008) describedherein can be either volatile memory or nonvolatile memory, or caninclude both volatile and nonvolatile memory. By way of illustration,and not limitation, nonvolatile memory can include read only memory(ROM), programmable ROM (PROM), electrically programmable ROM (EPROM),electrically erasable PROM (EEPROM), or flash memory. Volatile memorycan include random access memory (RAM), which acts as external cachememory. By way of illustration and not limitation, RAM is available inmany forms such as synchronous RAM (SRAM), dynamic RAM (DRAM),synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhancedSDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).The memory 1008 of the subject systems and methods is intended tocomprise, without being limited to, these and any other suitable typesof memory.

Receiver 1002 is further operatively coupled to a synchronization signalevaluator 1010 and/or a parameter identifier 1012. Synchronizationsignal evaluator 1010 can be substantially similar to synchronizationsignal evaluator 410 of FIG. 4. Moreover, parameter identifier 1012 canbe substantially similar to parameter identifier 412 of FIG. 4.Synchronization signal evaluator 1010 can evaluate synchronizationsignal(s) included in received radio frames. For example,synchronization signal evaluator 1010 can determine relative locationsof differing types of synchronization signals (e.g., relative locationsof a PSC versus a SSC, . . . ). According to another illustration,synchronization signal evaluator 1010 can recognize a sequence (e.g.,PSC sequence, . . . ) utilized to generate a particular type ofsynchronization signal (e.g., PSC, . . . ). Pursuant to anotherillustration, synchronization signal evaluator 1010 can analyze whetherthe radio frames include one or two types of synchronization signals(e.g., whether the radio frames include or lack PSCs, . . . ). Moreover,synchronization signal evaluator 1010 can review a PRS associated withthe radio frames. Further, parameter identifier 1012 can leverage theanalysis effectuated by synchronization signal evaluator 1010 todetermine one or more parameters corresponding to a base station thatsent the radio frames over the downlink. Access terminal 1000 stillfurther comprises a modulator 1014 and a transmitter 1016 that transmitsthe signal to, for instance, a base station, another access terminal,etc. Although depicted as being separate from the processor 1006, it isto be appreciated that synchronization signal evaluator 1010, parameteridentifier 1012 and/or modulator 1014 can be part of processor 1006 or anumber of processors (not shown).

FIG. 11 is an illustration of a system 1100 that utilizessynchronization signals to indicate parameter(s) to access terminals ina wireless communication environment. System 1100 comprises a basestation 1102 (e.g., access point, . . . ) with a receiver 1110 thatreceives signal(s) from one or more access terminals 1104 through aplurality of receive antennas 1106, and a transmitter 1122 thattransmits to the one or more access terminals 1104 through a transmitantenna 1108. Receiver 1110 can receive information from receiveantennas 1106 and is operatively associated with a demodulator 1112 thatdemodulates received information. Demodulated symbols are analyzed by aprocessor 1114 that can be similar to the processor described above withregard to FIG. 10, and which is coupled to a memory 1116 that storesdata to be transmitted to or received from access terminal(s) 1104 (or adisparate base station (not shown)) and/or any other suitableinformation related to performing the various actions and functions setforth herein. Processor 1114 is further coupled to a synchronizationsignal generator 1118 that yields synchronization signals fortransmission to access terminal(s) 1104 as a function of parameter(s)associated therewith. For instance, synchronization signal generator1118 can select PSC sequences based upon a parameter, position a PSC anda SSC in relative locations as a function of a parameter, included orexclude a PSC from a radio frame based upon a parameter, select a PRSbased upon a parameter, and so forth. It is contemplated thatsynchronization signal generator 1118 can be substantially similar tosynchronization signal generator 408 of FIG. 4. Although not shown, itis to be appreciated that synchronization signal generator 1118 caninclude a selector (e.g., substantially similar to selector 414 of FIG.4) and/or a scheduler (e.g., substantially similar to scheduler 416 ofFIG. 4). Further, synchronization signal generator 1118 can provideinformation to be transmitted (e.g., radio frame, . . . ) to a modulator1120. Modulator 1120 can multiplex a frame for transmission by atransmitter 1122 through antennas 1108 to access terminal(s) 1104.Although depicted as being separate from the processor 1114, it is to beappreciated that synchronization signal generator 1118 and/or modulator1120 can be part of processor 1114 or a number of processors (notshown).

FIG. 12 shows an example wireless communication system 1200. Thewireless communication system 1200 depicts one base station 1210 and oneaccess terminal 1250 for sake of brevity. However, it is to beappreciated that system 1200 can include more than one base stationand/or more than one access terminal, wherein additional base stationsand/or access terminals can be substantially similar or different fromexample base station 1210 and access terminal 1250 described below. Inaddition, it is to be appreciated that base station 1210 and/or accessterminal 1250 can employ the systems (FIGS. 1, 4, 10-11, and 13-14)and/or methods (FIGS. 7-9) described herein to facilitate wirelesscommunication there between.

At base station 1210, traffic data for a number of data streams isprovided from a data source 1212 to a transmit (TX) data processor 1214.According to an example, each data stream can be transmitted over arespective antenna. TX data processor 1214 formats, codes, andinterleaves the traffic data stream based on a particular coding schemeselected for that data stream to provide coded data.

The coded data for each data stream can be multiplexed with pilot datausing orthogonal frequency division multiplexing (OFDM) techniques.Additionally or alternatively, the pilot symbols can be frequencydivision multiplexed (FDM), time division multiplexed (TDM), or codedivision multiplexed (CDM). The pilot data is typically a known datapattern that is processed in a known manner and can be used at accessterminal 1250 to estimate channel response. The multiplexed pilot andcoded data for each data stream can be modulated (e.g., symbol mapped)based on a particular modulation scheme (e.g., binary phase-shift keying(BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying(M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected forthat data stream to provide modulation symbols. The data rate, coding,and modulation for each data stream can be determined by instructionsperformed or provided by processor 1230.

The modulation symbols for the data streams can be provided to a TX MIMOprocessor 1220, which can further process the modulation symbols (e.g.,for OFDM). TX MIMO processor 1220 then provides N_(T) modulation symbolstreams to N_(T) transmitters (TMTR) 1222 a through 1222 t. In variousembodiments, TX MIMO processor 1220 applies beamforming weights to thesymbols of the data streams and to the antenna from which the symbol isbeing transmitted.

Each transmitter 1222 receives and processes a respective symbol streamto provide one or more analog signals, and further conditions (e.g.,amplifies, filters, and upconverts) the analog signals to provide amodulated signal suitable for transmission over the MIMO channel.Further, N_(T) modulated signals from transmitters 1222 a through 1222 tare transmitted from N_(T) antennas 1224 a through 1224 t, respectively.

At access terminal 1250, the transmitted modulated signals are receivedby N_(R) antennas 1252 a through 1252 r and the received signal fromeach antenna 1252 is provided to a respective receiver (RCVR) 1254 athrough 1254 r. Each receiver 1254 conditions (e.g., filters, amplifies,and downconverts) a respective signal, digitizes the conditioned signalto provide samples, and further processes the samples to provide acorresponding “received” symbol stream.

An RX data processor 1260 can receive and process the N_(R) receivedsymbol streams from N_(R) receivers 1254 based on a particular receiverprocessing technique to provide N_(T) “detected” symbol streams. RX dataprocessor 1260 can demodulate, deinterleave, and decode each detectedsymbol stream to recover the traffic data for the data stream. Theprocessing by RX data processor 1260 is complementary to that performedby TX MIMO processor 1220 and TX data processor 1214 at base station1210.

A processor 1270 can periodically determine which available technologyto utilize as discussed above. Further, processor 1270 can formulate areverse link message comprising a matrix index portion and a rank valueportion.

The reverse link message can comprise various types of informationregarding the communication link and/or the received data stream. Thereverse link message can be processed by a TX data processor 1238, whichalso receives traffic data for a number of data streams from a datasource 1236, modulated by a modulator 1280, conditioned by transmitters1254 a through 1254 r, and transmitted back to base station 1210.

At base station 1210, the modulated signals from access terminal 1250are received by antennas 1224, conditioned by receivers 1222,demodulated by a demodulator 1240, and processed by a RX data processor1242 to extract the reverse link message transmitted by access terminal1250. Further, processor 1230 can process the extracted message todetermine which precoding matrix to use for determining the beamformingweights.

Processors 1230 and 1270 can direct (e.g., control, coordinate, manage,etc.) operation at base station 1210 and access terminal 1250,respectively. Respective processors 1230 and 1270 can be associated withmemory 1232 and 1272 that store program codes and data. Processors 1230and 1270 can also perform computations to derive frequency and impulseresponse estimates for the uplink and downlink, respectively.

In an aspect, logical channels are classified into Control Channels andTraffic Channels. Logical Control Channels can include a BroadcastControl Channel (BCCH), which is a DL channel for broadcasting systemcontrol information. Further, Logical Control Channels can include aPaging Control Channel (PCCH), which is a DL channel that transferspaging information. Moreover, the Logical Control Channels can comprisea Multicast Control Channel (MCCH), which is a Point-to-multipoint DLchannel used for transmitting Multimedia Broadcast and Multicast Service(MBMS) scheduling and control information for one or several MTCHs.Generally, after establishing a Radio Resource Control (RRC) connection,this channel is only used by UEs that receive MBMS (e.g., oldMCCH+MSCH). Additionally, the Logical Control Channels can include aDedicated Control Channel (DCCH), which is a Point-to-pointbi-directional channel that transmits dedicated control information andcan be used by UEs having a RRC connection. In an aspect, the LogicalTraffic Channels can comprise a Dedicated Traffic Channel (DTCH), whichis a Point-to-point bi-directional channel dedicated to one UE for thetransfer of user information. Also, the Logical Traffic Channels caninclude a Multicast Traffic Channel (MTCH) for Point-to-multipoint DLchannel for transmitting traffic data.

In an aspect, Transport Channels are classified into DL and UL. DLTransport Channels comprise a Broadcast Channel (BCH), a Downlink SharedData Channel (DL-SDCH) and a Paging Channel (PCH). The PCH can supportUE power saving (e.g., Discontinuous Reception (DRX) cycle can beindicated by the network to the UE, . . . ) by being broadcasted over anentire cell and being mapped to Physical layer (PHY) resources that canbe used for other control/traffic channels. The UL Transport Channelscan comprise a Random Access Channel (RACH), a Request Channel (REQCH),a Uplink Shared Data Channel (UL-SDCH) and a plurality of PHY channels.

The PHY channels can include a set of DL channels and UL channels. Forexample, the DL PHY channels can include: Common Pilot Channel (CPICH);Synchronization Channel (SCH); Common Control Channel (CCCH); Shared DLControl Channel (SDCCH); Multicast Control Channel (MCCH); Shared ULAssignment Channel (SUACH); Acknowledgement Channel (ACKCH); DL PhysicalShared Data Channel (DL-PSDCH); UL Power Control Channel (UPCCH); PagingIndicator Channel (PICH); and/or Load Indicator Channel (LICH). By wayof further illustration, the UL PHY Channels can include: PhysicalRandom Access Channel (PRACH); Channel Quality Indicator Channel(CQICH); Acknowledgement Channel (ACKCH); Antenna Subset IndicatorChannel (ASICH); Shared Request Channel (SREQCH); UL Physical SharedData Channel (UL-PSDCH); and/or Broadband Pilot Channel (BPICH).

It is to be understood that the embodiments described herein can beimplemented in hardware, software, firmware, middleware, microcode, orany combination thereof. For a hardware implementation, the processingunits can be implemented within one or more application specificintegrated circuits (ASICs), digital signal processors (DSPs), digitalsignal processing devices (DSPDs), programmable logic devices (PLDs),field programmable gate arrays (FPGAs), processors, controllers,micro-controllers, microprocessors, other electronic units designed toperform the functions described herein, or a combination thereof.

When the embodiments are implemented in software, firmware, middlewareor microcode, program code or code segments, they can be stored in amachine-readable medium, such as a storage component. A code segment canrepresent a procedure, a function, a subprogram, a program, a routine, asubroutine, a module, a software package, a class, or any combination ofinstructions, data structures, or program statements. A code segment canbe coupled to another code segment or a hardware circuit by passingand/or receiving information, data, arguments, parameters, or memorycontents. Information, arguments, parameters, data, etc. can be passed,forwarded, or transmitted using any suitable means including memorysharing, message passing, token passing, network transmission, etc.

For a software implementation, the techniques described herein can beimplemented with modules (e.g., procedures, functions, and so on) thatperform the functions described herein. The software codes can be storedin memory units and executed by processors. The memory unit can beimplemented within the processor or external to the processor, in whichcase it can be communicatively coupled to the processor via variousmeans as is known in the art.

With reference to FIG. 13, illustrated is a system 1300 that enablesefficiently indicating one or more parameters to at least one accessterminal in a wireless communication environment. For example, system1300 can reside at least partially within a base station. It is to beappreciated that system 1300 is represented as including functionalblocks, which can be functional blocks that represent functionsimplemented by a processor, software, or combination thereof (e.g.,firmware). System 1300 includes a logical grouping 1302 of electricalcomponents that can act in conjunction. For instance, logical grouping1302 can include an electrical component for scheduling a primarysynchronization code (PSC) and a secondary synchronization code (SSC) atrelative locations in a radio frame as a function of a parametercorresponding to a base station 1304. Moreover, logical grouping cancomprise an electrical component for sending the radio frame over adownlink to identify the parameter based upon the relative locations ofthe PSC and the SSC 1306. Further, although not shown, logical groupingcan also include an electrical component for selecting a PSC sequencebased upon a parameter of the base station and an electrical componentfor generating the PSC based upon the selected PSC sequence.Additionally, system 1300 can include a memory 1308 that retainsinstructions for executing functions associated with electricalcomponents 1304 and 1306. While shown as being external to memory 1308,it is to be understood that one or more of electrical components 1304and 1306 can exist within memory 1308.

Turning to FIG. 14, illustrated is a system 1400 that enablesidentifying one or more parameters relative to a base station in awireless communication environment. System 1400 can reside within anaccess terminal, for instance. As depicted, system 1400 includesfunctional blocks that can represent functions implemented by aprocessor, software, or combination thereof (e.g., firmware). System1400 includes a logical grouping 1402 of electrical components that canact in conjunction. Logical grouping 1402 can include an electricalcomponent for analyzing a radio frame received from a base station todecipher at least one of relative locations of disparate types ofsynchronization signals, a sequence utilized to generate a particulartype of synchronization signal, or whether the radio frame includes twotypes of synchronization signals 1404. For instance, the disparate typesof synchronization signals can be PSCs and SSCs. Moreover, the sequencecan be a PSC sequence. Further, the radio frame can be analyzed todetermine whether it includes at least one PSC and at least one SSC orat least one SSC without a PSC. Further, logical grouping 1402 caninclude an electrical component for recognizing at least one parameterassociated with the base station based upon the relative locations, thesequence, or whether the radio frame includes two types ofsynchronization signals 1406. Additionally, system 1400 can include amemory 1408 that retains instructions for executing functions associatedwith electrical components 1404 and 1406. While shown as being externalto memory 1408, it is to be understood that electrical components 1404and 1406 can exist within memory 1408.

What has been described above includes examples of one or moreembodiments. It is, of course, not possible to describe everyconceivable combination of components or methodologies for purposes ofdescribing the aforementioned embodiments, but one of ordinary skill inthe art may recognize that many further combinations and permutations ofvarious embodiments are possible. Accordingly, the described embodimentsare intended to embrace all such alterations, modifications andvariations that fall within the spirit and scope of the appended claims.Furthermore, to the extent that the term “includes” is used in eitherthe detailed description or the claims, such term is intended to beinclusive in a manner similar to the term “comprising” as “comprising”is interpreted when employed as a transitional word in a claim.

1. A method that facilitates identifying one or more parameters relatedto a base station in a wireless communication environment, comprising:generating a primary synchronization code (PSC) and a secondarysynchronization code (SSC); scheduling the PSC and the SSC at relativelocations in a radio frame as a function of a first parametercorresponding to a base station; and transmitting the radio frame over adownlink to indicate the first parameter based upon the relativelocations of the PSC and the SSC.
 2. The method of claim 1, wherein thefirst parameter is one or more of whether the base station is part of atime division duplex (TDD) system or a frequency division duplex (FDD)system, whether the radio frame employs frame structure type 1 (FS1) orframe structure type 2 (FS2), whether the base station is associatedwith a macro cell or a femto cell, or whether the base station isassociated with a unicast system or a multicast system.
 3. The method ofclaim 1, further comprising: mapping the PSC to a last symbol in one ormore slots of the radio frame and the SSC to an adjacent symbolimmediately prior to the last symbol when frame structure type 1 isemployed by the base station; and mapping SSC to the last symbol in oneor more slots of the radio frame and the PSC to the adjacent symbolimmediately prior to the last symbol when frame structure type 2 isemployed by the base station.
 4. The method of claim 1, furthercomprising: selecting a primary synchronization code (PSC) sequencebased upon a second parameter of the base station, the second parameterbeing substantially similar or differing from the first parameter; andgenerating the PSC based upon the selected PSC sequence.
 5. The methodof claim 4, further comprising selecting the PSC sequence from a set offour possible PSC sequences, the set includes three commonly utilizedPSC sequences and a fourth, additional PSC sequence.
 6. The method ofclaim 5, wherein two of the three commonly utilized PSC sequences arecomplex conjugates of each other, and a remaining PSC sequence of thethree commonly utilized PSC sequences and the fourth, additional PSCsequence are complex conjugates of each other.
 7. The method of claim 5,further comprising: selecting one of the three commonly utilized PSCsequences when frame structure type 1 is employed by the base station;and selecting the fourth, additional PSC sequence when frame structuretype 2 is employed by the base station.
 8. The method of claim 5,further comprising: selecting one of the three commonly utilized PSCsequences when a unicast carrier is employed by the base station; andselecting the fourth, additional PSC sequence when a multicast carrieris employed by the base station.
 9. The method of claim 1, furthercomprising mapping different pseudo random sequences (PRSs) to a commoncell ID as a function of a third parameter associated with the basestation.
 10. The method of claim 1, further comprising mapping pseudorandom sequences (PRSs) to different tone locations as a function of afourth parameter associated with the base station.
 11. The method ofclaim 1, further comprising eliminating the PSC from the radio framewhen utilizing frame structure type
 2. 12. The method of claim 1,further comprising selecting a particular scrambling code from a set ofpossible scrambling codes to be employed on top of a SSC sequence toyield the SSC as a function of a fifth parameter associated with thebase station.
 13. The method of claim 1, further comprising selecting aset of possible scrambling codes, from which a particular scramblingcode can be chosen to be utilized on top of a SSC sequence to generatethe SSC, as a function of a sixth parameter associated with the basestation.
 14. A wireless communications apparatus, comprising: a memorythat retains instructions related to selecting a primary synchronizationcode (PSC) sequence based upon a first parameter of a base station,generating a primary synchronization code (PSC) based upon the selectedPSC sequence, and transmitting a radio frame that includes the generatePSC over a downlink to indicate the first parameter based upon theselected PSC sequence; and a processor, coupled to the memory,configured to execute the instructions retained in the memory.
 15. Thewireless communications apparatus of claim 14, wherein the firstparameter is one or more of whether the base station is part of a timedivision duplex (TDD) system or a frequency division duplex (FDD)system, whether the radio frame employs frame structure type 1 (FS1) orframe structure type 2 (FS2), whether the base station is associatedwith a macro cell or a femto cell, or whether the base station isassociated with a unicast system or a multicast system.
 16. The wirelesscommunications apparatus of claim 14, wherein the memory further retainsinstructions related to selecting the PSC sequence from a set of fourpossible PSC sequences, the set includes three commonly utilized PSCsequences and a fourth, additional PSC sequence.
 17. The wirelesscommunications apparatus of claim 16, wherein two of the three commonlyutilized PSC sequences are complex conjugates of each other, and aremaining PSC sequence of the three commonly utilized PSC sequences andthe fourth, additional PSC sequence are complex conjugates of eachother.
 18. The wireless communications apparatus of claim 16, whereinthe memory further retains instructions related to selecting one of thethree commonly utilized PSC sequences when frame structure type 1 isemployed by the base station, and selecting the fourth, additional PSCsequence when frame structure type 2 is employed by the base station.19. The wireless communications apparatus of claim 16, wherein thememory further retains instructions related to selecting one of thethree commonly utilized PSC sequences when a unicast carrier is employedby the base station, and selecting the fourth, additional PSC sequencewhen a multicast carrier is employed by the base station.
 20. Thewireless communications apparatus of claim 14, wherein the memoryfurther retains instructions related to generating a secondarysynchronization code (SSC), and scheduling the PSC and the SSC atrelative positions in the radio frame as a function of a secondparameter related to the base station.
 21. The wireless communicationsapparatus of claim 20, wherein the memory further retains instructionsrelated to mapping the PSC to a last symbol in one or more slots of theradio frame and the SSC to an adjacent symbol immediately prior to thelast symbol when frame structure type 1 is employed by the base station,and mapping SSC to the last symbol in one or more slots of the radioframe and the PSC to the adjacent symbol immediately prior to the lastsymbol when frame structure type 2 is employed by the base station. 22.The wireless communications apparatus of claim 20, wherein the memoryfurther retains instructions related to selecting at least one of a setof possible scrambling codes or a particular scrambling code from theset of possible scrambling codes as a function of one or more parametersrelated to the base station.
 23. The wireless communications apparatusof claim 14, wherein the memory further retains instructions related tomapping different pseudo random sequences (PRSs) to a common cell ID asa function of a third parameter associated with the base station. 24.The wireless communications apparatus of claim 14, wherein the memoryfurther retains instructions related to mapping differing pseudo randomsequences (PRSs) to different tone locations as a function of a fourthparameter associated with the base station.
 25. The wirelesscommunications apparatus of claim 14, wherein the memory further retainsinstructions related to eliminating the PSC from the radio frame whenutilizing frame structure type
 2. 26. A wireless communicationsapparatus that enables efficiently indicating one or more parameters toat least one access terminal in a wireless communication environment,comprising: means for scheduling a primary synchronization code (PSC)and a secondary synchronization code (SSC) at relative locations in aradio frame as a function of a first parameter corresponding to a basestation; and means for sending the radio frame over a downlink toidentify the first parameter based upon the relative locations of thePSC and the SSC.
 27. The wireless communications apparatus of claim 26,wherein the first parameter is one or more of whether the base stationis part of a time division duplex (TDD) system or a frequency divisionduplex (FDD) system, whether the radio frame employs frame structuretype 1 (FS1) or frame structure type 2 (FS2), whether the base stationis associated with a macro cell or a femto cell, or whether the basestation is associated with a unicast system or a multicast system. 28.The wireless communications apparatus of claim 26, further comprising:means for mapping the PSC to a last symbol in one or more slots of theradio frame and the SSC to an adjacent symbol immediately prior to thelast symbol when frame structure type 1 is employed by the base station;and means for mapping SSC to the last symbol in one or more slots of theradio frame and the PSC to the adjacent symbol immediately prior to thelast symbol when frame structure type 2 is employed by the base station.29. The wireless communications apparatus of claim 26, furthercomprising: means for selecting a PSC sequence based upon a secondparameter of the base station; and means for means for generating thePSC based upon the selected PSC sequence.
 30. The wirelesscommunications apparatus of claim 29, further comprising means forselecting the PSC sequence from a set of four possible PSC sequences,the set includes three commonly utilized PSC sequences and a fourth,additional PSC sequence.
 31. The wireless communications apparatus ofclaim 30, wherein two of the three commonly utilized PSC sequences arecomplex conjugates of each other, and a remaining PSC sequence of thethree commonly utilized PSC sequences and the fourth, additional PSCsequence are complex conjugates of each other.
 32. The wirelesscommunications apparatus of claim 30, further comprising: means forselecting one of the three commonly utilized PSC sequences when framestructure type 1 is employed by the base station; and means forselecting the fourth, additional PSC sequence when frame structure type2 is employed by the base station.
 33. The wireless communicationsapparatus of claim 30, further comprising: means for selecting one ofthe three commonly utilized PSC sequences when a unicast carrier isemployed by the base station; and means for selecting the fourth,additional PSC sequence when a multicast carrier is employed by the basestation.
 34. The wireless communications apparatus of claim 26, furthercomprising means for mapping different pseudo random sequences (PRSs) toa common cell ID as a function of a third parameter associated with thebase station.
 35. The wireless communications apparatus of claim 26,further comprising means for mapping pseudo random sequences (PRSs) todifferent tone locations as a function of a fourth parameter associatedwith the base station.
 36. The wireless communications apparatus ofclaim 26, further comprising means for eliminating the PSC from theradio frame when utilizing frame structure type
 2. 37. The wirelesscommunications apparatus of claim 26, further comprising means forselecting a particular scrambling code from a set of possible scramblingcodes to be used on top of a SSC sequence to generate the SSC as afunction of a fifth parameter related to the base station.
 38. Thewireless communications apparatus of claim 26, further comprising meansfor selecting a set of possible scrambling codes to utilize inconnection with the SSC as a function of a sixth parameter associatedwith the base station.
 39. A computer program product, comprising: acomputer-readable medium comprising: code for selecting a primarysynchronization code (PSC) sequence based upon a first parameter of abase station; code for generating a primary synchronization code (PSC)based upon the selected PSC sequence; and code for transmitting a radioframe that includes the generate PSC over a downlink to indicate thefirst parameter based upon the selected PSC sequence.
 40. The computerprogram product of claim 39, wherein the first parameter is one or moreof whether the base station is part of a time division duplex (TDD)system or a frequency division duplex (FDD) system, whether the radioframe employs frame structure type 1 (FS1) or frame structure type 2(FS2), whether the base station is associated with a macro cell or afemto cell, or whether the base station is associated with a unicastsystem or a multicast system.
 41. The computer program product of claim39, wherein the computer-readable medium further comprises code forselecting the PSC sequence from a set of four possible PSC sequences,the set includes three commonly utilized PSC sequences and a fourth,additional PSC sequence.
 42. The computer program product of claim 41,wherein two of the three commonly utilized PSC sequences are complexconjugates of each other, and a remaining PSC sequence of the threecommonly utilized PSC sequences and the fourth, additional PSC sequenceare complex conjugates of each other.
 43. The computer program productof claim 41, wherein the computer-readable medium further comprises codefor selecting one of the three commonly utilized PSC sequences whenframe structure type 1 is employed by the base station, and code forselecting the fourth, additional PSC sequence when frame structure type2 is employed by the base station.
 44. The computer program product ofclaim 41, wherein the computer-readable medium further comprises codefor selecting one of the three commonly utilized PSC sequences when aunicast carrier is employed by the base station, and code for selectingthe fourth, additional PSC sequence when a multicast carrier is employedby the base station.
 45. The computer program product of claim 39,wherein the computer-readable medium further comprises code forgenerating a secondary synchronization code (SSC), and code forscheduling the PSC and the SSC at relative positions in the radio frameas a function of a second parameter related to the base station.
 46. Thecomputer program product of claim 45, wherein the computer-readablemedium further comprises code for mapping the PSC to a last symbol inone or more slots of the radio frame and the SSC to an adjacent symbolimmediately prior to the last symbol when frame structure type 1 isemployed by the base station, and code for mapping SSC to the lastsymbol in one or more slots of the radio frame and the PSC to theadjacent symbol immediately prior to the last symbol when framestructure type 2 is employed by the base station.
 47. The computerprogram product of claim 45, wherein the computer-readable mediumfurther comprises code for selecting at least one of a set of possiblescrambling codes or a particular scrambling code from the set ofpossible scrambling codes as a function of one or more parametersrelated to the base station.
 48. The computer program product of claim39, wherein the computer-readable medium further comprises code formapping different pseudo random sequences (PRSs) to a common cell ID asa function of a third parameter associated with the base station. 49.The computer program product of claim 39, wherein the computer-readablemedium further comprises code for mapping differing pseudo randomsequences (PRSs) to different tone locations as a function of a fourthparameter associated with the base station.
 50. The computer programproduct of claim 39, wherein the computer-readable medium furthercomprises code for eliminating the PSC from the radio frame whenutilizing frame structure type
 2. 51. In a wireless communicationssystem, an apparatus comprising: a processor configured to: schedule aprimary synchronization code (PSC) and a secondary synchronization code(SSC) at relative locations in a radio frame as a function of a firstparameter corresponding to a base station; and send the radio frame overa downlink to identify the first parameter based upon the relativelocations of the PSC and the SSC.
 52. A method that facilitatesdeciphering at least one parameter corresponding to a base station in awireless communication environment, comprising: receiving a radio framefrom a base station; analyzing the radio frame to determine at least oneof relative locations of disparate types of synchronization signals, asequence utilized to generate a particular type of synchronizationsignal, or whether the radio frame includes two types of synchronizationsignals; and recognizing at least one parameter associated with the basestation based upon the relative locations, the sequence, or whether theradio frame includes two types of synchronization signals.
 53. Themethod of claim 52, further comprising: identifying the relativelocations of a primary synchronization code (PSC) and a secondarysynchronization code (SSC); and recognizing one or more of the at leastone parameter based at least in part upon the identified relativelocations.
 54. The method of claim 52, further comprising: determining aprimary synchronization code (PSC) sequence utilized to generate a PSCincluded in the received radio frame; and deciphering one or more of theat least one parameter based at least in part upon the determined PSCsequence.
 55. The method of claim 52, further comprising: identifyingwhether a PSC is included or excluded from the radio frame; anddetermining one or more of the at least one parameter based at least inpart upon whether the PSC is included or excluded from the radio frame.56. The method of claim 52, further comprising: analyzing a pseudorandom sequence mapping associated with the radio frame; and determiningone or more of the at least one parameter based at least in part uponthe pseudo random sequence mapping.
 57. The method of claim 52, furthercomprising: identifying a scrambling code utilized by the base stationto scramble a SSC; and determining one or more of the at least oneparameter based at least in part upon the identity of the scramblingcode.
 58. The method of claim 52, wherein the at least one parameter isone or more of whether the base station is part of a time divisionduplex (TDD) system or a frequency division duplex (FDD) system, whetherthe radio frame employs frame structure type 1 (FS1) or frame structuretype 2 (FS2), whether the base station is associated with a macro cellor a femto cell, or whether the base station is associated with aunicast system or a multicast system.
 59. A wireless communicationsapparatus, comprising: a memory that retains instructions related toreceiving a radio frame from a base station, analyzing the radio frameto determine at least one of relative locations of disparate types ofsynchronization signals, a sequence utilized to generate a particulartype of synchronization signal, or whether the radio frame includes twotypes of synchronization signals, and recognizing at least one parameterassociated with the base station based upon the relative locations, thesequence, or whether the radio frame includes two types ofsynchronization signals; and a processor, coupled to the memory,configured to execute the instructions retained in the memory.
 60. Thewireless communications apparatus of claim 59, wherein the memoryfurther retains instructions related to identifying the relativelocations of a primary synchronization code (PSC) and a secondarysynchronization code (SSC), and recognizing one or more of the at leastone parameter based at least in part upon the identified relativelocations.
 61. The wireless communications apparatus of claim 59,wherein the memory further retains instructions related to determining aprimary synchronization code (PSC) sequence utilized to generate a PSCincluded in the received radio frame, and deciphering one or more of theat least one parameter based at least in part upon the determined PSCsequence.
 62. The wireless communications apparatus of claim 59, whereinthe memory further retains instructions related to identifying whether aPSC is included or excluded from the radio frame, and determining one ormore of the at least one parameter based at least in part upon whetherthe PSC is included or excluded from the radio frame.
 63. The wirelesscommunications apparatus of claim 59, wherein the memory further retainsinstructions related to analyzing a pseudo random sequence mappingassociated with the radio frame, and determining one or more of the atleast one parameter based at least in part upon the pseudo randomsequence mapping.
 64. The wireless communications apparatus of claim 59,wherein the memory further retains instructions related to identifying ascrambling code utilized by the base station to scramble a SSC, anddetermining one or more of the at least one parameter based at least inpart upon the identity of the scrambling code.
 65. The wirelesscommunications apparatus of claim 59, wherein the at least one parameteris one or more of whether the base station is part of a time divisionduplex (TDD) system or a frequency division duplex (FDD) system, whetherthe radio frame employs frame structure type 1 (FS1) or frame structuretype 2 (FS2), whether the base station is associated with a macro cellor a femto cell, or whether the base station is associated with aunicast system or a multicast system.
 66. A wireless communicationsapparatus that enable identifying one or more parameters relative to abase station in a wireless communication environment, comprising: meansfor analyzing a radio frame received from a base station to decipher atleast one of relative locations of disparate types of synchronizationsignals, a sequence utilized to generate a particular type ofsynchronization signal, or whether the radio frame includes two types ofsynchronization signals; and means for recognizing at least oneparameter associated with the base station based upon the relativelocations, the sequence, or whether the radio frame includes two typesof synchronization signals.
 67. The wireless communications apparatus ofclaim 66, further comprising: means for identifying the relativelocations of a primary synchronization code (PSC) and a secondarysynchronization code (SSC); and means for recognizing one or more of theat least one parameter based at least in part upon the identifiedrelative locations.
 68. The wireless communications apparatus of claim66, further comprising: means for determining a primary synchronizationcode (PSC) sequence utilized to generate a PSC included in the receivedradio frame; and means for deciphering one or more of the at least oneparameter based at least in part upon the determined PSC sequence. 69.The wireless communications apparatus of claim 66, further comprising:means for identifying whether a PSC is included or excluded from theradio frame; and means for determining one or more of the at least oneparameter based at least in part upon whether the PSC is included orexcluded from the radio frame.
 70. The wireless communications apparatusof claim 66, further comprising: means for analyzing a pseudo randomsequence mapping associated with the radio frame; and means fordetermining one or more of the at least one parameter based at least inpart upon the pseudo random sequence mapping.
 71. The wirelesscommunications apparatus of claim 66, further comprising: means foridentifying a scrambling code utilized by the base station to scramble aSSC; and means for deciphering one or more of the at least one parameterbased at least in part upon the identity of the scrambling code.
 72. Thewireless communications apparatus of claim 66, wherein the at least oneparameter is one or more of whether the base station is part of a timedivision duplex (TDD) system or a frequency division duplex (FDD)system, whether the radio frame employs frame structure type 1 (FS1) orframe structure type 2 (FS2), whether the base station is associatedwith a macro cell or a femto cell, or whether the base station isassociated with a unicast system or a multicast system.
 73. A computerprogram product, comprising: a computer-readable medium comprising: codefor analyzing a radio frame received from a base station to decipher atleast one of relative locations of disparate types of synchronizationsignals, a sequence utilized to generate a particular type ofsynchronization signal, or whether the radio frame includes two types ofsynchronization signals; and code for recognizing at least one parameterassociated with the base station based upon the relative locations, thesequence, or whether the radio frame includes two types ofsynchronization signals.
 74. The wireless communications apparatus ofclaim 73, wherein the computer-readable medium further comprises codefor identifying the relative locations of a primary synchronization code(PSC) and a secondary synchronization code (SSC), and code forrecognizing one or more of the at least one parameter based at least inpart upon the identified relative locations.
 75. The wirelesscommunications apparatus of claim 73, wherein the computer-readablemedium further comprises code for determining a primary synchronizationcode (PSC) sequence utilized to generate a PSC included in the receivedradio frame, and code for deciphering one or more of the at least oneparameter based at least in part upon the determined PSC sequence. 76.The wireless communications apparatus of claim 73, wherein thecomputer-readable medium further comprises code for identifying whethera PSC is included or excluded from the radio frame, and code fordetermining one or more of the at least one parameter based at least inpart upon whether the PSC is included or excluded from the radio frame.77. The wireless communications apparatus of claim 73, wherein thecomputer-readable medium further comprises code for analyzing a pseudorandom sequence mapping associated with the radio frame, and code fordetermining one or more of the at least one parameter based at least inpart upon the pseudo random sequence mapping.
 78. The wirelesscommunications apparatus of claim 73, wherein the computer-readablemedium further comprises code for recognizing an identity of ascrambling code used by a base station to scramble a SSC, and code fordetermining one or more of the at least one parameter based at least inpart upon the identity of the scrambling code.
 79. The wirelesscommunications apparatus of claim 73, wherein the at least one parameteris one or more of whether the base station is part of a time divisionduplex (TDD) system or a frequency division duplex (FDD) system, whetherthe radio frame employs frame structure type 1 (FS1) or frame structuretype 2 (FS2), whether the base station is associated with a macro cellor a femto cell, or whether the base station is associated with aunicast system or a multicast system.
 80. In a wireless communicationssystem, an apparatus comprising: a processor configured to: evaluate aradio frame received from a base station to decipher at least one ofrelative locations of disparate types of synchronization signals, asequence utilized to generate a particular type of synchronizationsignal, or whether the radio frame includes two types of synchronizationsignals; and determine at least one parameter associated with the basestation based upon the relative locations, the sequence, or whether theradio frame includes two types of synchronization signals.